I couldn't see how close the pipes were to the manifold, at 1/2 inch I'm with Moose in just sync em and see how it runs. Don't bother with the copper tube, it doesn't work that well (it's been done). In the tech section under "IMPROVING DRIVEABILITY WITH MULTIPLE ROCHESTERS" You will find all you need to know to make them work better, jetting tips and all that. You'll have to get it running to see what you need for jets. I had two on my '41 Chevy (235 W/split exhaust) and after the mods, they ran better and got better mileage than the single did!
